Recently, people began noticing the Facebook iOS app was draining battery life at a rapid clip. An engineer for the company just explained it was basically a big mistake on their end. Some sleuthing led many to discover there were issues with audio sessions, which some attributed to Facebook toying with an always-on listening service. Others assumed Facebook was simply listening in on the world’s conversations. Not so much. Facebook’s Ari Grant explained the issue: The first issue we found was a “CPU spin” in our network code. A CPU spin is like a child in a car asking, “Are…
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